2 files changed, 47 insertions, 8 deletions
diff --git a/packages/instant/src/redux/actions.ts b/packages/instant/src/redux/actions.ts
index 5a4099f15..46045024b 100644
--- a/packages/instant/src/redux/actions.ts
+++ b/packages/instant/src/redux/actions.ts
@@ -2,6 +2,8 @@ import { BuyQuote } from '@0x/asset-buyer';
 import { BigNumber } from '@0x/utils';
 import * as _ from 'lodash';
 
+import { BigNumberInput } from '../util/big_number_input';
+
 import { ActionsUnion, OrderState } from '../types';
 
 export interface PlainAction<T extends string> {
@@ -36,7 +38,8 @@ export enum ActionTypes {
 
 export const actions = {
     updateEthUsdPrice: (price?: BigNumber) => createAction(ActionTypes.UPDATE_ETH_USD_PRICE, price),
-    updateSelectedAssetAmount: (amount?: BigNumber) => createAction(ActionTypes.UPDATE_SELECTED_ASSET_AMOUNT, amount),
+    updateSelectedAssetAmount: (amount?: BigNumberInput) =>
+        createAction(ActionTypes.UPDATE_SELECTED_ASSET_AMOUNT, amount),
     updateBuyOrderState: (orderState: OrderState) => createAction(ActionTypes.UPDATE_BUY_ORDER_STATE, orderState),
     updateLatestBuyQuote: (buyQuote?: BuyQuote) => createAction(ActionTypes.UPDATE_LATEST_BUY_QUOTE, buyQuote),
     updateSelectedAsset: (assetData?: string) => createAction(ActionTypes.UPDATE_SELECTED_ASSET, assetData),
diff --git a/packages/instant/src/redux/reducer.ts b/packages/instant/src/redux/reducer.ts
index 25d0092b2..614ed21ac 100644
--- a/packages/instant/src/redux/reducer.ts
+++ b/packages/instant/src/redux/reducer.ts
@@ -1,6 +1,7 @@
 import { AssetBuyer, BuyQuote } from '@0x/asset-buyer';
-import { ObjectMap } from '@0x/types';
+import { AssetProxyId, ObjectMap } from '@0x/types';
 import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import * as _ from 'lodash';
 
 import { assetMetaDataMap } from '../data/asset_meta_data_map';
@@ -14,6 +15,7 @@ import {
     OrderState,
 } from '../types';
 import { assetUtils } from '../util/asset';
+import { BigNumberInput } from '../util/big_number_input';
 
 import { Action, ActionTypes } from './actions';
 
@@ -22,7 +24,7 @@ export interface State {
     assetBuyer?: AssetBuyer;
     assetMetaDataMap: ObjectMap<AssetMetaData>;
     selectedAsset?: Asset;
-    selectedAssetAmount?: BigNumber;
+    selectedAssetAmount?: BigNumberInput;
     buyOrderState: OrderState;
     ethUsdPrice?: BigNumber;
     latestBuyQuote?: BuyQuote;
@@ -56,11 +58,19 @@ export const reducer = (state: State = INITIAL_STATE, action: Action): State =>
                 selectedAssetAmount: action.data,
             };
         case ActionTypes.UPDATE_LATEST_BUY_QUOTE:
-            return {
-                ...state,
-                latestBuyQuote: action.data,
-                quoteRequestState: AsyncProcessState.SUCCESS,
-            };
+            const newBuyQuoteIfExists = action.data;
+            const shouldUpdate =
+                _.isUndefined(newBuyQuoteIfExists) || doesBuyQuoteMatchState(newBuyQuoteIfExists, state);
+            if (shouldUpdate) {
+                return {
+                    ...state,
+                    latestBuyQuote: newBuyQuoteIfExists,
+                    quoteRequestState: AsyncProcessState.SUCCESS,
+                };
+            } else {
+                return state;
+            }
+
         case ActionTypes.SET_QUOTE_REQUEST_STATE_PENDING:
             return {
                 ...state,
@@ -121,3 +131,29 @@ export const reducer = (state: State = INITIAL_STATE, action: Action): State =>
             return state;
     }
 };
+
+const doesBuyQuoteMatchState = (buyQuote: BuyQuote, state: State): boolean => {
+    const selectedAssetIfExists = state.selectedAsset;
+    const selectedAssetAmountIfExists = state.selectedAssetAmount;
+    // if no selectedAsset or selectedAssetAmount exists on the current state, return false
+    if (_.isUndefined(selectedAssetIfExists) || _.isUndefined(selectedAssetAmountIfExists)) {
+        return false;
+    }
+    // if buyQuote's assetData does not match that of the current selected asset, return false
+    if (selectedAssetIfExists.assetData !== buyQuote.assetData) {
+        return false;
+    }
+    // if ERC20 and buyQuote's assetBuyAmount does not match selectedAssetAmount, return false
+    // if ERC721, return true
+    const selectedAssetMetaData = selectedAssetIfExists.metaData;
+    if (selectedAssetMetaData.assetProxyId === AssetProxyId.ERC20) {
+        const selectedAssetAmountBaseUnits = Web3Wrapper.toBaseUnitAmount(
+            selectedAssetAmountIfExists,
+            selectedAssetMetaData.decimals,
+        );
+        const doesAssetAmountMatch = selectedAssetAmountBaseUnits.eq(buyQuote.assetBuyAmount);
+        return doesAssetAmountMatch;
+    } else {
+        return true;
+    }
+};